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llvm-mc/AsmParser: Allow target to specific a comment delimiter, which will be

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used to strip hard coded comments out of .td assembly strings.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@78716 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Daniel Dunbar 2009-08-11 20:59:47 +00:00
parent a942ad3d99
commit 59fc42debd
3 changed files with 43 additions and 1 deletions
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11
include/llvm/Target/Target.td
View File

@ -484,6 +484,17 @@ class AsmParser {
// used to support targets that need to parser multiple formats for the
// assembly language.
int Variant = 0;
// CommentDelimiter - If given, the delimiter string used to recognize
// comments which are hard coded in the .td assembler strings for individual
// instructions.
string CommentDelimiter = "";
// RegisterPrefix - If given, the token prefix which indicates a register
// token. This is used by the matcher to automatically recognize hard coded
// register tokens as constrained registers, instead of tokens, for the
// purposes of matching.
string RegisterPrefix = "";
}
def DefaultAsmParser : AsmParser;

6
lib/Target/X86/X86.td
View File

@ -182,6 +182,12 @@ include "X86CallingConv.td"
def ATTAsmParser : AsmParser {
string AsmParserClassName = "ATTAsmParser";
int Variant = 0;
// Discard comments in assembly strings.
string CommentDelimiter = "#";
// Recognize hard coded registers.
string RegisterPrefix = "%";
}
// The X86 target supports two different syntaxes for emitting machine code.

27
utils/TableGen/AsmMatcherEmitter.cpp
View File

@ -501,6 +501,15 @@ public:
class AsmMatcherInfo {
public:
/// The tablegen AsmParser record.
Record *AsmParser;
/// The AsmParser "CommentDelimiter" value.
std::string CommentDelimiter;
/// The AsmParser "RegisterPrefix" value.
std::string RegisterPrefix;
/// The classes which are needed for matching.
std::vector<ClassInfo*> Classes;
@ -537,6 +546,8 @@ private:
void BuildOperandClasses(CodeGenTarget &Target);
public:
AsmMatcherInfo(Record *_AsmParser);
/// BuildInfo - Construct the various tables used during matching.
void BuildInfo(CodeGenTarget &Target);
};
@ -778,6 +789,13 @@ void AsmMatcherInfo::BuildOperandClasses(CodeGenTarget &Target) {
}
}
AsmMatcherInfo::AsmMatcherInfo(Record *_AsmParser)
: AsmParser(_AsmParser),
CommentDelimiter(AsmParser->getValueAsString("CommentDelimiter")),
RegisterPrefix(AsmParser->getValueAsString("RegisterPrefix"))
{
}
void AsmMatcherInfo::BuildInfo(CodeGenTarget &Target) {
// Build info for the register classes.
BuildRegisterClasses(Target);
@ -801,6 +819,13 @@ void AsmMatcherInfo::BuildInfo(CodeGenTarget &Target) {
II->Instr = &it->second;
II->AsmString = FlattenVariants(CGI.AsmString, 0);
// Remove comments from the asm string.
if (!CommentDelimiter.empty()) {
size_t Idx = StringRef(II->AsmString).find(CommentDelimiter);
if (Idx != StringRef::npos)
II->AsmString = II->AsmString.substr(0, Idx);
}
TokenizeAsmString(II->AsmString, II->Tokens);
// Ignore instructions which shouldn't be matched.
@ -1309,7 +1334,7 @@ void AsmMatcherEmitter::run(raw_ostream &OS) {
EmitMatchRegisterName(Target, AsmParser, OS);
// Compute the information on the instructions to match.
AsmMatcherInfo Info;
AsmMatcherInfo Info(AsmParser);
Info.BuildInfo(Target);
// Sort the instruction table using the partial order on classes.